A straightforward method to synthesize imidazole derivatives from amidines and sulfoxonium ylides catalyzed by acids is reported in this study. Specifically, catalyzed by trifluoroacetic acid in DCE solvents can improve synthesis efficiency under metal-free conditions. A series of imidazole scaffolds were produced in good to excellent yields.
A novel and simple t‐BuOLi/I2‐mediated synthesis of 1,2,4‐trisubstituted imidazoles was developed without transition‐metal added. The transition‐metal‐free strategy tolerated a range of substrates and provided products in moderate to good yields with 100% regioselectivity.
在不添加过渡金属的情况下,开发了新颖,简单的t- BuOLi / I 2介导的1,2,4-三取代咪唑合成方法。不含过渡金属的策略可耐受多种底物,并提供中等至良好产率的产品,区域选择性为100%。
Copper and zinc co-catalyzed synthesis of imidazoles via the activation of sp3 C–H and N–H bonds
An efficient and facile approach to synthesize imidazoles from amidines and arylketone via oxidative coupling of sp(3) C-H bond and N-H bond is reported. This strategy exhibits high performance in terms of regioselectivity with moderate to high yields by using easily available materials, and provides an alternative method to synthesize multi-substituted imidazole skeletons. (C) 2014 Elsevier Ltd. All rights reserved.